package com.hn.Interceptor;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class HttpRequestInterceptor  extends HandlerInterceptorAdapter{

    private final Logger log = LoggerFactory.getLogger(HttpRequestInterceptor.class);

    public  static  final  String  LAST_PAGE = "lastPage";
    /**
     * 在业务处理器处理请求之前被调用
     * 如果返回false
     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
     *
     * 如果返回true
     *    执行下一个拦截器,直到所有的拦截器都执行完毕
     *    再执行被拦截的Controller
     *    然后进入拦截器链,
     *    从最后一个拦截器往回执行所有的postHandle()
     *    接着再从最后一个拦截器往回执行所有的afterCompletion()
     */
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {

        HttpSession session = request.getSession();
        String requestURI = request.getRequestURI();
        String contextPath = request.getContextPath();
        String url = requestURI.substring(contextPath.length() + 1);
        System.out.println("\033[31;4m"+ "请求的接口是：" + "\033[0m"+"\033[33;4m" +requestURI + "\033[0m");
        request.setAttribute("url", url);
        //判断是否是异步请求
        boolean isAjax = false;
        String requestType = request.getHeader("X-Requested-With");
        if (requestType != null && requestType.equals("XMLHttpRequest")) {// 异步
            System.out.println("\033[31;4m"+ "加载的接口是：" + "\033[0m"+"\033[33;4m" +requestURI + "\033[0m");
            isAjax = true;
        }


        if ("GET".equalsIgnoreCase(request.getMethod())) {
            request.getRequestURI();
        }

        return true;


    }
    /**
     * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
     * 可在modelAndView中加入数据，比如当前时间
     */
    @Override
    public void postHandle(HttpServletRequest request,
                           HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        log.info("==============执行顺序: 2、postHandle================");
        if(modelAndView != null){  //加入当前时间
            modelAndView.addObject("haha", "测试postHandle");
        }
    }
    /**
     * 在DispatcherServlet完全处理完请求后被调用,可用于清理资源等
     * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
     */
    @Override
    public void afterCompletion(HttpServletRequest request,
                                HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        log.info("==============接口加载完毕: afterCompletion================");
    }
}